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GMC Master
1,348 Answers
- Posted on Aug 22, 2009
Re: What is the spark plug gap for the envoy??
They come pre gapped with collars to prevent the electrodes from getting bent .platinum and iridium plugs will have the surface damaged if you were to adjust them with a feeler gauge,like old plugs had to be gapped. ac or ngk plugs come pre gapped in the box.
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